public class code {
    public static void main(String[] args) {
        int count = 0;
        for (int i = 1; i <= 100; i++){
            if(i % 10 == 9){
                count++;
            }
            else if (i / 10 == 9){
                count++;
            }
        }
        System.out.println(count+1);
    }
}
